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Home Shop Entry Level Fountain Pens Gravitas - Ultemate Vac Acrylic
GravitasSKU: TTP1

Gravitas - Ultemate Vac Acrylic

€200,00 €140,00 / Sale Sold out
Tax not included. Shipping calculated at checkout.
4.92 (13 reviews)
Nib: Steel
Nib Size: Extra Fine
Gravitas - Ultemate Vac Acrylic
€200,00 €140,00 /
Nib: Steel
Nib Size: Extra Fine

 
 
Description

Introducing the Gravitas Ultemate Vac, a groundbreaking design and Gravitas' inaugural venture into complex filling systems. This fountain pen redefines durability, incorporating titanium in key areas to ensure longevity, addressing common weaknesses found in other vacuum pens. 

The design emphasizes the utilization of exceptionally durable materials to ensure longevity. Titanium is strategically employed to reinforce vulnerable areas where other vacuum pens may falter. Despite its robust construction, the pen remains lightweight, featuring a transparent acrylic section that enables you to monitor the ink level in the second chamber.

Despite its robust construction, the fountain pen remains lightweight, featuring a transparent Ultem section that allows for easy monitoring of ink levels in the secondary chamber. Easy to clean and maintain since the whole design is put together using threads and gaskets, different from other vacuum pens assembled using glue.

The 25mm-long section, tapering from 11.9mm to 10.2mm in width, provides a comfortable grip that is well known by fountain pen users - the hour glas shape. The nib is a steel size #6 designed and manufactured by Gravitas - paired with abs plastic feeder.

With a generous capacity exceeding 2.5ml and a secondary chamber holding 0.7ml, the Ultemate Vac offers ample ink for extended writing sessions. The second chamber is equipped with a shut-off valve to prevent ink mishaps, ensuring a mess-free experience. When using the Ultimate Vac it is recommended for the end knob to be unscrewed, thus offering a more constant and wet ink flow. 

Designed for convenience, this pen can be posted and disassembled for thorough cleaning. A crucial note: when removing the nib or cleaning the pen, apply silicone grease carefully to the threads and barrel inside to maintain water-tight integrity/smooth operating plunger and prevent ink spills. The exact sleeve presented in the picture with the box of the pen is not available anymore.

Elevate your writing experience with the innovative and resilient Gravitas Ultemate Vac.

Specifications:

- brand: Gravitas
- type: Fountain Pen
- color: Demonstrator
- body material: Acrylic
- cap type: Screw-cap
- filling mechanism: Vacuum 
- nib material: Steel 
- nib size: Extra Fine, Fine, Medium
- postable: Yes
- trim: Silver
- length overall (closed): 150 mm
- length overall (posted): 160 mm
- body length: 142 mm
- cap length: 65 mm
- body diameter: 15 mm
- cap diameter (without clip): 16 mm
- weight (overall): 30 grams
- body weight: 25 grams
- cap weight: 5 grams

Specifications

Brand: Gravitas
Model: Ultemate Vac
Edition:
Color: Demonstrator
Body Material: Acrylic
Finish:

Cap Type:
Screw
Filling Mechanism:
Vacuum Filler
Postable:
Yes
Trim Color: Silver
Length Overall (Closed): 150 mm
Length Overall (Posted): 160 mm
Body Length (Uncapped):
142 mm
Body Diameter: 15 mm
Cap Diameter (Without Clip): 16 mm
Weight Overall: 30 g
Body Weight: 25 g

Customer Reviews

Based on 13 reviews
Write a review
92%
(12)
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92.3
100.0
M
Miguel @ USA
⭐️⭐️⭐️⭐️⭐️ Outstanding Pen and Customer Experience!

I recently purchased the GRAVITAS – ULTEMATE VAC ACRYLIC from Pen Venture, and I couldn’t be happier. This is both my first Gravitas pen and my first order from Pen Venture.

Delivery was incredibly fast—I placed my order on August 12 (evening, USA time) and the pen was in my hands by August 18 via DHL. That speed alone was impressive!

I reached out to Emy to ask about setup, and not only did he set up the nib, but he also prepped the pen and included a handwritten note thanking me for my purchase. That kind of personal touch and customer service is rare these days, and it really stood out.

As for the pen itself: I’ve been eyeing this model for a while, and when I saw it on sale, I finally decided to pull the trigger. I’m so glad I did. The ULTEMATE VAC ACRYLIC is everything I hoped for and more. I love vac-fill pens (my Pilot 823 is another favorite), and this Gravitas instantly joined that league. Even without a gold nib, it writes beautifully—smooth, consistent, and very enjoyable. The weight and balance in the hand feel fantastic, making it a true pleasure to write with.

After just one day of use, I can already say this has become one of my favorite pens. And one thing is certain: this will not be my last purchase from Pen Venture.

Thank you for everything, Emy!

— Miguel

T
Tobias
Pure Writing Joy By Gravitas

Sleek, transparent, and impeccably built, the Ultemate Vac Acrylic is as stunning to look at as it is to write with. Its flawless acrylic body showcases the clever vacuum filling system, while the perfectly tuned nib delivers smooth, consistent ink flow with zero fuss. Comfortable and well-balanced this pen turns every page into a pleasure. A true blend of beauty and performance.

P
Peter
Absolutely Superb Customer Service!

I placed my order (my first with Pen Venture) on Saturday 2 August and my Gravitas Ultemate Vac Acrylic arrived at my doorstep the following Friday, from Romania to North Carolina, USA. 6 days!!

I asked Emy if he would check the nib for smoothness and ink flow. This pen is now my smoothest, most delightful writer I have. It out performs most of my gold nibs. I couldn't be more pleased!! Not only did Emy ensure my new pen was perfect, and achieve outstanding order fulfillment, Emy wrote a personal letter of thanks. This guy is one of a kind!

If I'm looking for a special pen in the future I'm going to check Pen Venture first!

All the Best, Peter

User picture
J
Josh Tuck
Deal of the year.

If you haven't pulled the trigger on one of these yet — do so. Mine arrived quickly with a hand written letter (Not a note — a letter) telling me it was tested and tuned, and Emy did not disappoint. For me it has the perfect amount of feedback from the nib. Not too scratchy or too slippery. With a medium nib it's nice and juice on every kind of paper I've tried it on — even Tomoe River which my fine nibbed Sentries have trouble with.

I went back and forth on whether to get this or not. Ultimately, this was one of those purchases that has brought me joy every time I use it.

O
Otis M
My second Gravitas.

Writes like butter! Thanks Emi! Very smooth, low feedback, great flow.

123
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© 2026 Pen Venture - Passion Virtuous,

★ Reviews

Let customers speak for us

857 reviews
Write a review
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49
A
Gravitas - Vac 2.0 Aluminium | Black
Andreas Andersson
Substantial, reliable, and smooth

The Gravitas Vac 2.0 is an amazing tool for handwriting. The nib is smooth, distinct, and reliable, and it has some weight due to its durable materials, black aluminium/aluminum and ultem, the perfect combination of a tool which will survive most of us, still functioning if the internal vacuum piston system is cared for. I have enjoyed this fountain pen for seven days and I am pleased to say it is one of my better ones, and it is fun to use. I recommend it.

(Emy was correct: The nib has great flow, about six drops of ink will automatically flow from the nib after I have just filled it, after that no problems; tissue paper or the ink bottle under the nib until that happens is recommended, other than that: an excellent fountain pen.)

D
Tombow - Mono Sand 512B | Ink Eraser
Dan Shapiro
Mono sand combo eraser

This is good. It erases well

N
Gravitas - Vac 2.0 Aluminium | Black
Nabil Zouari
FANTASTIC !!!!!

What a fantastic pen—and customized too!

It writes beautifully and arrived surprisingly quickly, even though I’m in Canada. This is my third order from Pen Venture, and once again, the experience has been outstanding. It's always a pleasure to come back.

My Gravitas arrived perfectly tuned and was ready to write straight out of the box. I filled it with Pelikan Royal Blue, and from the very first stroke, it was smooth, consistent, and an absolute joy to use.

I own several excellent fountain pens, including a Pilot Custom 823, a Sailor 1911, and a Leonardo Momento Zero, and I can honestly say that this Gravitas holds its own among them. It is remarkably well made and comes very close to being the perfect writing instrument.

A big thank you to the entire Pen Venture team for the exceptional service, careful tuning, and attention to detail. I’m already looking forward to my next order!

C
Gravitas - Vac 2.0 Aluminium | Black
Cosmin R.
A Worthy Sequel to an Awesome Pen

On its own, this pen feels very durable and premium, and the bead-blasted, matte black coated treatment gives it a very “professional” vibe. The Fine nib is bouncy and smooth, very usable on the underside as well (with added feedback, but not scratchy), the ribbed steel grip is very comfortable, the feed holds a lot of ink on its own, and the reservoirs behind it will keep it in writing condition for dozens upon dozens of pages after a fill.

The cap screws open and closed smoothly, with a very satisfying click at the end when closed; it posts deeply, and it also posts securely after being pressed down slightly on the barrel. It is light enough that it does not back-weight the pen significantly when posted.

The barrel construction, along with the newly-implemented Kraken filling system, ensure a significant amount of ink is pulled in from the first try. Much like the main cap, the blind-cap screws open and closed smoothly for refills or ink transfers between reservoirs.

Compared to its predecessor:
Fewer transparent areas overall, but the Vac 2.0’s structure feels more solid than the Ultemate Vac.
The body thickness and thread profiles are different on the Vac 2.0 than on the Ultemate Vac, no mix-and-match potential here.
The matte black coating gives the pen a more refined, premium feel on the metallic parts.
The inner lining of the cap doesn’t get stuck in the barrel thread as often, and when it does, it either slips back into correct position, or it is easier to unscrew and reposition, without the metal thread eating into the cap material.
The coated, no-breather-hole design of the new Gravitas steel nib may not be to everyone’s taste, but I like it a lot, and functionally, this nib feels more bouncy and polished, with smoother writing than its predecessor.
The feed seems to pick up a lot more ink on its own from just a 5-second dip, and the small reservoir behind it looks to have more capacity to back it up before needing to unscrew the blind cap and refill it from the large reservoir.
The Kraken filling system seems to suck up significantly more ink per pump than the mechanism from the Ultemate Vac.

Overall, a very well made fountain pen, and a thorough refinement to an already excellent design. Very satisfied with this purchase!

User picture User picture
K
Gravitas - Vac 2.0 Aluminium | Black
Keith Schumacker
Great Little Monster

Wow!
Just like the Monster but thinner. For me it is more comfortable for longer writing sessions. The filling system is stellar. Holds lots of ink. As always Ben Walsh and Emy have delivered a innovative and enjoyable writing experience. Can't wait to see what's next. Keep up the wonderful work!

123
Review picture
Cosmin R.
A Worthy Sequel to an Awesome Pen

On its own, this pen feels very durable and premium, and the bead-blasted, matte black coated treatment gives it a very “professional” vibe. The Fine nib is bouncy and smooth, very usable on the underside as well (with added feedback, but not scratchy), the ribbed steel grip is very comfortable, the feed holds a lot of ink on its own, and the reservoirs behind it will keep it in writing condition for dozens upon dozens of pages after a fill.

The cap screws open and closed smoothly, with a very satisfying click at the end when closed; it posts deeply, and it also posts securely after being pressed down slightly on the barrel. It is light enough that it does not back-weight the pen significantly when posted.

The barrel construction, along with the newly-implemented Kraken filling system, ensure a significant amount of ink is pulled in from the first try. Much like the main cap, the blind-cap screws open and closed smoothly for refills or ink transfers between reservoirs.

Compared to its predecessor:
Fewer transparent areas overall, but the Vac 2.0’s structure feels more solid than the Ultemate Vac.
The body thickness and thread profiles are different on the Vac 2.0 than on the Ultemate Vac, no mix-and-match potential here.
The matte black coating gives the pen a more refined, premium feel on the metallic parts.
The inner lining of the cap doesn’t get stuck in the barrel thread as often, and when it does, it either slips back into correct position, or it is easier to unscrew and reposition, without the metal thread eating into the cap material.
The coated, no-breather-hole design of the new Gravitas steel nib may not be to everyone’s taste, but I like it a lot, and functionally, this nib feels more bouncy and polished, with smoother writing than its predecessor.
The feed seems to pick up a lot more ink on its own from just a 5-second dip, and the small reservoir behind it looks to have more capacity to back it up before needing to unscrew the blind cap and refill it from the large reservoir.
The Kraken filling system seems to suck up significantly more ink per pump than the mechanism from the Ultemate Vac.

Overall, a very well made fountain pen, and a thorough refinement to an already excellent design. Very satisfied with this purchase!

Gravitas - Vac 2.0 Aluminium | Black